Recorded from real Commodore 64s, one "breadbin" with a SID 6581 chip and one Commodore 64C with a SID 8580 chip. Except both Game Over tracks, these are cut off a second or two before they end in the game so these are recorded output of the Acid 64 player using jsiddevice to get the whole track.
In many cases the two versions of the SID chip sound exactly the same. In some other cases, tracks written for 6581 are broken on the later 8580. And in still other cases they are not exactly broken on the 8580, they just sound different. And some people will be used to hearing them that way from back in the day. So in these instances I record both versions.
The releasedate is taken from the cracktro. This game was actually never officially released, it got cancelled at a late stage. So a late beta version that got leaked is all we have of it, which is where the music is taken from.